You know, I'm usually of the mind that, by the time women post on here with some down-played report of a domestic spat, there's a problematic husband whose intransigence will emerge in subsequent posts and the solution will often be to abandon their sinking ship of a marriage.
This one's different. He doesn't sound, as reported, like a very nice man. However, if I were having daily conversations with someone like OP, I'd be having the screaming abjabs! I'd be fairly likely to resort to sarcasm myself.
She's been talking for ages about her conference plans, yet "respectfully" asks DH if he's got any plans for the same weekend. Well, obviously, he's going to have some idea that his plans involve looking after their daughter.
But she offers that IF she goes to the conference, she can't take DD. What? Is she now changing her mind about the conference? And who asked her to take the child there? Nobody did!
Ahh, she's not changing her mind - so why the cavilling? But she seems to think DH doesn't want to do parenting. In his shoes, I'd be bloody offended too.
Oh, she IS changing her mind! Why? Because DD will spend the weekend playing on her ipad. Huh? Is that really a reason to cancel this longed-for conference trip?
Ah, okay, DD will be fine. But OP still isn't going to her thing. Now why not? Because of DH, who won't "let her have anything for herself". I'm flummoxed, and I'm not even married to her ... at what point did he forbid her to go?
He didn't forbid her. As far as I can tell, he failed to say something like "Go to your conference, darling, and have a wonderful time! Don't worry about DD, I shall spend the weekend teaching her Latin irregular verbs while preparing a series of Cordon Bleu dishes. We'll both miss you terribly."
And she's not going. Because DH didn't forbid her but didn't have any special plans for the weekend. This means she can't have anything for herself.
Fuck my life 
@Marie2023 PLEASE DO AN ASSERTIVENESS COURSE!